Investigating the surface roughness of implant prepared by combining fused deposition modeling and investment casting

Abstract

Fused deposition modeling is widely used for printing three-dimensional models of biomedical implants as functional/ nonfunctional prototypes. In the present work, experimental investigations have been made for controlling surface roughness of implant (hip joint) prepared by combining fused deposition modeling and investment casting as a case study. The process started with printing of implant (hip joint patterns) using acrylonitrile butadiene styrene (ABS) as filament material with fused deposition modeling and, thereafter, functional prototype has been developed through investment casting route using SS316L. Three controllable factors of the investment casting process (namely, number of slurry layers, slurry viscosity, and dry time of primary layer) were studied at three levels each by Taguchi's parametric approach and single-response optimization was conducted to identify the main factors controlling surface roughness (R a ) of cast specimens. The results of the study suggest that for R a , percentage contribution of number of layer, viscosity of primary dip, and dry time of primary coating is 41%, 32%, and 25%, respectively.

Experimental investigations into mechanical and thermal properties of rapid manufactured copper parts

“…On the other side, the indirect rapid manufacturing techniques such as combination of polymer three-dimensional (3D) printing and conventional processing methods gives advantage to fabricate customized metal components at low cost and in a controlled manner 16–18 . Bai et al.…”

Surface texture evaluation of additively manufactured metallic cellular scaffolds for acetabular implants using X-ray computed tomography

“…These metallic interconnected cellular structures have an optimal combination of surface roughness, pore size and porosity [3,4]. Rough surface texture can promote cell attachment and proliferation [5]; good biocompatibility can be achieved by using bio-friendly metal materials, e.g. titanium and its alloys; suitable pore morphology and porosity can mimic the structure of native bone to promote cell in-growth and provide channels for nutrient and waste transportation [6]; cellular structure can reduce the weight of implants while keeping necessary mechanical properties and, in addition, alleviate the mechanical mismatch between metallic implant and natural bone, which 1 3 might cause bone resorption and eventually the failure of metallic implant fixation [7].…”

Geometric Modeling of Cellular Materials for Additive Manufacturing in Biomedical Field: A Review

“…Firstly, a porous scaffold enables nutrients and waste material to diffuse, and secondly, the percentage of porosity can be used to reach the same mechanical properties as the original bone; furthermore, studies [ 77 , 78 ] showed that highly porous scaffold is not always the right approach for a well-designed scaffold, because even if there is a higher tissue regeneration, biomechanical properties become weak. Also surface finishing and texturing influence tissue ingrowth and fluid dynamics; rough surfaces increase the reaction of osteogenic cells [ 79 ] and offer more surface area for integrating [ 80 ], while fine-surface finish has to be preferred in joint application, as it reduces friction during motion [ 81 ].…”